Numerical simulation of spent pot-lining to blast furnace tuyere injection

This study investigated the potential use of spent pot-lining (SPL) as a supplementary fuel in blast furnaces to replace pulverized coal (PC). Based on actual blast furnace operational parameters, a three-dimensional numerical model is established to simulate the complex flow and reaction processes in the tuyere raceway. The impact of the proportion of SPL in the mixed fuel from 0 % to 45 % on the thermochemical characteristics of the mixed fuel combustion is analyzed. The results indicate that with an increase in SPL proportion, the combustion peak temperature (2511 K-2922 K) and the average temperature in the raceway (2014 K-2474 K) of the mixed fuel both increase. However, the combustion rate of the mixed fuel decreases, highlighting the need for a rational design of the mixed fuel ratio to optimize combustion performance. The SPL proportion has minimal influence on the aerodynamic characteristics of the airflow but significantly affects combustion and thermal properties, altering the distribution of gas-phase components. Through linear regression and correlation analysis, linear relationships between SPL proportion and combustion rate, peak temperature in the raceway, and CO and CO 2 mass fractions are established. This research holds substantial significance and value in advancing the technology of using industrial waste SPL to replace part of the coal powder as blast furnace injection fuel, promoting the development of green metallurgical technologies, and contributing to global energy conservation and emission reduction.